Pen, Will, and Cat met during the first week of their first year of college and struck up a remarkable friendship, one that sustained them and shaped them for years - until it ended abruptly, and they went their separate ways. Now, six years later, Pen is a single mother of a five-year-old girl, living with her older brother in Philadelphia and trying to make peace with the sudden death of her father. Despite feeling deserted by Will and Cat, she has always wanted them back in her life, so when Cat emails, asking her to go to their college reunion, Pen goes. What happens there sends past and present colliding and sends all of them on a journey that will change everything.

Pen Calloway, estranged from her college friends Cat and Will for six years, has missed them through the birth of her daughter, the death of her father, and the struggles of single motherhood, and must decide how far she will go to get her friends back in her life after Cat ends the silence between them with an urgent summons to a college reunion.